There's good reason to believe that electric cars are the future and will soon be a massive market. I think there's also good reason to believe that Tesla has a big head start on the competition and has the opportunity to dominate this market if they execute well.

For example, just look at the battery packs which are essential to an electric car. Tesla was unable to find a supplier that could meet their requirements, so they designed and produced their own batteries and now have a $5 billion gigafactory to increase production volume and decrease costs (with more gigafactories on the way). If you're another car company trying to enter the EV market, what are your options? Buy inferior battery packs at a higher cost from a different supplier? Try to replicate Tesla's battery technology and then convince your board to build a gigafactory so you can produce them at the required volume and cost?